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Finding the Fourth Proportional to 841.93, 1,258.05 and 643.18

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Solution

The fourth proportional to 841.93, 1,258.05 and 643.18 is: 961.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.93 : 1,258.05 = 643.18 : x
  2. Step 2: Convert to fraction form
    841.93/1,258.05 = 643.18/x
  3. Step 3: Cross multiply
    841.93x = 1,258.05 × 643.18
  4. Step 4: Simplify right side
    841.93x = 809,146.31
  5. Step 5: Solve for x
    x = 809,146.31/841.93
  6. Step 6: Final answer
    x = 961.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.